Display panel or portion thereof with a transitional graphical user interface



FIG. 1 is a front view of a display panel or portion thereof with agraphical user interface showing a first image in a sequence of ourdesign;

FIG. 2 is a front view of a display panel or portion thereof with agraphical user interface showing a second image in the sequence thereof;and,

FIG. 3 is a front view of a display panel or portion thereof with agraphical user interface showing a third image in the sequence thereof.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-3. The process or period in whichone image transitions to another image forms no part of the claimeddesign.

The dot-dash-dot broken lines depicting a display panel or portionthereof are included for the purpose of illustrating portions of thearticle of manufacture and form no part of the claimed design. Theremaining dot-dot broken lines, including all text, illustrate portionsof the graphical user interface that form no part of the claimed design.

CLAIM The ornamental design for a display panel or portion thereof witha transitional graphical user interface, as shown and described.